[PATCH -next] gma500: medfield: fix potential NULL pointer dereference in mdfld_dsi_brightness_init()

[Wei Yongjun]

From: Wei Yongjun <yongjun_...@trendmicro.com.cn>

The dereference to 'sender' should be moved below the NULL test.

Signed-off-by: Wei Yongjun <yongjun_wei at trendmicro.com.cn>
---
 drivers/gpu/drm/gma500/mdfld_dsi_output.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/gma500/mdfld_dsi_output.c 
b/drivers/gpu/drm/gma500/mdfld_dsi_output.c
index 637dd84..478f8b9 100644
--- a/drivers/gpu/drm/gma500/mdfld_dsi_output.c
+++ b/drivers/gpu/drm/gma500/mdfld_dsi_output.c
@@ -92,8 +92,8 @@ void mdfld_dsi_brightness_init(struct mdfld_dsi_config 
*dsi_config, int pipe)
 {
        struct mdfld_dsi_pkg_sender *sender =
                                mdfld_dsi_get_pkg_sender(dsi_config);
-       struct drm_device *dev = sender->dev;
-       struct drm_psb_private *dev_priv = dev->dev_private;
+       struct drm_device *dev;
+       struct drm_psb_private *dev_priv;
        u32 gen_ctrl_val;

        if (!sender) {
@@ -101,6 +101,8 @@ void mdfld_dsi_brightness_init(struct mdfld_dsi_config 
*dsi_config, int pipe)
                return;
        }

+       dev = sender->dev;
+       dev_priv = dev->dev_private;
        /* Set default display backlight value to 85% (0xd8)*/
        mdfld_dsi_send_mcs_short(sender, write_display_brightness, 0xd8, 1,
                                true);